https://github.com/hyperoslo/mystore-ios/issues/1506

https://twittercommunity.com/t/crash-logs-show-hidden-and-cant-be-symbolicated/59103

for d in dSYMs/*                                                                                                                                    
    dwarfdump $d | grep "hidden"
end

https://twittercommunity.com/t/crash-logs-have---hidden-since-my-last-uploads-to-itunes/64661/7

That is the expected behavior. The reason why the dSYM you downloaded contains "__hidden#" is because you didn't share the symbols with Apple. The symbols are intentionally obfuscated so Apple cannot see them nor recover them.
There are few options:

1. Share the symbols with Apple. Apple will be able to generate symbolicated crash for you and the dSYM you downloaded from iTunes will not contains "__hidden#" as well.
2. Using dsymutil to recover the symbols from the dSYM bundle you downloaded. You need to locate the archive for the corresponding submission and there should be a directory named "BCSymbolMaps". Run:
   dsymutil --symbol-map PATH_TO_BCSYMBOLMAPS_DIR downloaded.dSYM

for d in dSYMs/*
   dsymutil --symbol-map path/to/file.xcarchive/BCSymbolMaps $d
end

BCSymbolMaps https://forums.developer.apple.com/thread/14729

A BCSymbolMap is a lot like a dSYM for bitcode

These BCSymbolMap files are generated when you build the associated framework/app

Copy bcsymbolmap files when building Carthage/Carthage#853

http://stackoverflow.com/questions/32925498/error-during-submission

http://www.slideshare.net/syoikeda/how-to-handle-bitcode

BITCODE_GENERATION_MODE Carthage/Carthage#535 (comment)

http://stackoverflow.com/questions/9977625/crashlog-links-to-which-dsym

dwarfdump --uuid yourapp.app.dSYM
mdfind "com_apple_xcode_dsym_uuids == 5255A87A-B23C-3AE8-B367-14B49C21C1D6"